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Effect of Estimation of the Process Parameters on the Control Limits of the Univariate Control Charts for Process Dispersion

By Petros Maravelakis, John Panaretos and Stelios Psarakis

Abstract

Control charts are extensively used in many real world applications. Since process parameters are rarely known, common practice is to estimate them. Then, the control limits are modified and become actually random variables. In this paper, we deal with the univariate control charts for dispersion for both rational subgroups and individual measurements. We study the effect of estimating the process parameters of these charts on the first two moments of the run length distribution. The results are used for proposing appropriate values of sample size and number of samples in order to make the estimated control limits perform as the theoretical ones

Topics: C1 - Econometric and Statistical Methods and Methodology: General
Year: 2002
DOI identifier: 10.1081/sac-120003851
OAI identifier: oai:mpra.ub.uni-muenchen.de:6386

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